This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Benefits of technology
[0008]When the switching mode for the plurality of switching elements is switched from a non-zero vector to a zero vector or from a zero vector to a non-z
Problems solved by technology
This may increase surge
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Example
First Embodiment
[0045]Referring to the drawings, particularly to FIG. 1, there is illustrated a three-phase brushless motor, referred to simply as “motor”, 10 and a control system 11 for controlling the motor 10.
[0046]For example, the motor 10 is provided with an annular rotor having a rotor core. The rotor core of the rotor is provided at its circumferential portion with at least one N and S pole pair. The rotor has a direct axis (d-axis) in line with a rotor N pole center line, and has a quadrature axis (q-axis) whose phase is π / 2 radian electric angle leading with respect to a corresponding d-axis during rotation of the rotor.
[0047]The stator includes a stator core with, for example, an annular shape in its lateral cross section. The stator core is for example disposed around the outer periphery of the rotor core such that the inner periphery of the stator core is opposite to the outer periphery of the rotor core with a predetermined air gap.
[0048]The stator core also has a plura...
Example
Second Embodiment
[0374]A control system according to a second embodiment of the present invention will be described hereinafter with reference to FIG. 24.
[0375]The structure of the control system according to the second embodiment is substantially identical to that of the control system 11 according to the first embodiment. So, like parts between the control systems according to the first and second embodiments, to which like reference characters are assigned, are omitted or simplified in description.
[0376]Referring to FIG. 4, each of the modules 80, 82, and 84 according to the second embodiment includes a common logic function illustrated in FIG. 22.
[0377]Specifically, as can be seen from the comparison between the respective routines illustrated in FIGS. 7, 8, and 11, the logic structures of the respective routines illustrated in FIGS. 7, 8, and 11 are identical to each other. In other words, each of the routines illustrated in FIGS. 7, 8, and 11 has a common logic structure, indi...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
A control system is designed to use a plurality of voltage vectors expressing a switching mode for a switching circuit to thereby control a difference between a current actually flowing through a multiphase rotary machine and a command current value therefor within an allowable range. The plurality of voltage vectors include a zero vector that allows line-to-line voltages in the multiphase rotary machine to be all zero, and a plurality of non-zero vectors that allow at least one of line-to-line voltage in the multiphase rotary machine to be nonzero. A drive unit is configured to switch only one phase of the switching element for each shift of the switching mode to thereby shift, in accordance with a preset switching pattern, the switching mode from a specified one of the plurality of non-zero vectors to the specified one of the plurality of non-zero vectors via the zero vector.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is based on Japanese Patent Application 2007-327022 filed on Dec. 19, 2007. This application claims the benefit of priority from the Japanese Patent Application, so that the descriptions of which are all incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to control systems for multiphase rotary machines. More particularly, such control systems are designed to drive a plurality of switching elements of a power converter to thereby control the difference between a value of a current actually flowing in a multiphase rotary machine and a command value for the current such that the difference remains within a preset allowable range.BACKGROUND OF THE INVENTION[0003]An example of such control systems for controlling the difference between a value of a current actually flowing in a multiphase rotary machine and a command value for the current such that the difference remains within a preset...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more